I was watching Alexz's video when my son walked by a few days ago. He glanced over and his off handed comment was “too stiff”.
IMO, Alexz is holding his body (torso) way too stiff. He is focused on the perfect form. Reading the body language, I can see in his head, he is asking himself, “Am I doing this right? Am I doing that right?”. All the noise in his head is affecting his skiing. Similar to what happens in golf. It’s all in the head. You are your biggest enemy. If the damn ball would only move, then we would have something to react to. Things would be much simpler.
When I am at Taos, I skied with a pretty big clutch of off duty instructors most days of the season. To a person, they are all out there to have fun. Yeah, some may be works on stuff occasionally but invariably they are there to have fun. Trust me, none of them skied like the golf carts
@LiquidFeet often mentioned.
Good skiing flows. The body has to flow with it. Good skiers have a disciplined upper body, not a stiff one.
My advice is stop thinking about it and just go free skiing. Rather than working on the perfect instructor turns. Focus on the sensations and having fun. Only do a post-mortem after a completed run or a long set of turns. This is similar to racers and instructors will often free ski to become more centered, balanced and versatile in their skiing. The improvement from free skiing will translate into better performance in the gates and/or instructor type turns.
It is easier to ski down to a turn rather than up to a turn from an ability stand point.